Long scratches on a rock, a few millimetres across, formed by glacial abrasion, usually in clusters, often well developed on the stoss side of roches moutonées. Striations
can show the direction of glacier movement
(Fjellanger (2006) Geomorph 82, 3–4). From: striations in A Dictionary of Geography »
What is meant by striation?
1a :
the fact or state of being striated
. b : arrangement of striations or striae. 2 : a minute groove, scratch, or channel especially when one of a parallel series. 3 : any of the alternate dark and light cross bands of a myofibril of striated muscle.
What does striation mean in geography?
Geology.
any of a number of scratches or parallel grooves on the surface of a rock
, resulting from the action of moving ice, as of a glacier.
What does striation mean in earth science?
Striations are
lines or scratches on rock surfaces
, usually no more than a few millimeters in depth, produced by the process of glacial abrasion (Glasser and Bennett, 2004). From: Developments in Earth Surface Processes, 2015.
What is a striation and what does it do?
In hyperbolic geometry, a striation is
a reflection across two parallel mirrors
. In anatomy, striated muscle. Striations can be found in certain glasses. These have been caused by turbulent flow during teeming (pouring) of the glass. Striations can be observed in clouds.
How is a striation formed?
These scratches, “striations,” can be used to understand past ice flow. This rock has been scratched so much it shines with “glacier polish.” … Over time,
the glacier moves over rock and sediment
, leaving striations or striae, on the rock surfaces that can reveal the direction that the glacier was flowing.
What do drumlins mean?
Drumlins are elongated,
teardrop-shaped hills of rock, sand, and gravel that formed under moving glacier ice
. They can be up to 2 kilometers (1.25 miles) long. Long after the glacier retreats, a drulin provides clues to the glacier’s formation. —
Is striation a word?
striated
condition or appearance
. a stria; one of many parallel striae.
Is cardiac muscle a striation?
Cardiac muscle cells are located in the walls of the heart,
appear striated
, and are under involuntary control.
What are two special features of cardiac muscle?
Like skeletal muscle, cardiac muscle cells are striated due to a similar arrangement of contractile proteins. Unique to the cardiac muscle are
a branching morphology and the presence of intercalated discs found between muscle fibers
.
What are muscle striations caused by?
The striations are caused by
the regular arrangement of contractile proteins (actin and myosin)
. Actin is a globular contractile protein that interacts with myosin for muscle contraction.
What does the word moraines mean?
A moraine is
any accumulation of unconsolidated debris
(regolith and rock), sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions, and that has been previously carried along by a glacier or ice sheet.
What is the main function of striated muscle?
The primary function of striated muscles is
to generate force and contract in
order to support respiration, locomotion, and posture (skeletal muscle) and to pump blood throughout the body (cardiac muscle).
What are muscle striations and what do they tell us?
Striated muscle tissue is a muscle tissue
that features repeating functional units called sarcomeres
. The presence of sarcomeres manifests as a series of bands visible along the muscle fibers, which is responsible for the striated appearance observed in microscopic images of this tissue.
What is the main function of smooth muscle?
The primary function of smooth muscle is
contraction
. Smooth muscle consists of two types: single-unit and multi-unit. Single-unit smooth muscle consists of multiple cells connected through connexins that can become stimulated in a synchronous pattern from only one synaptic input.
